Converting array to polyline using Arcade with ArcGIS Pro

Question

Arcade/ArcGIS Pro 2.9:

I have an array of polyline vertices:

[[[670634.3148,4862051.3579,null],[670719.3321,4862051.0072,null],[670721.44381227,4862055.2956567,null],
[670724.26721751,4862059.1529319,null],[670727.71675869,4862062.4621395,null],[670731.6879051,4862065.1230012,null],
[670736.06031997,4862067.0548856,null],[670740.70150695,4862068.1992512,null],[670745.47082515,4862068.5214206,null],
[670750.22375097,4862068.011631,null],[670754.81625751,4862066.6853305,null],[670759.10917905,4862064.5827098,null],
[670762.97242811,4862061.7674841,null],[670766.2889375,4862058.3249626,null],[670768.95820776,4862054.3594632,null],
[670770.89935255,4862049.9911516,null],[670772.0535498,4862045.3523998,null],[670772.38582412,4862040.583775,null],
[670771.88610666,4862035.8297796,null],[670770.56954026,4862031.2344731,null],[670768.47602054,4862026.9371059,null],
[670765.66898698,4862023.0679004,null],[670762.2335005,4862019.7441041,null],[670758.27366592,4862017.0664373,null],
[670753.90947724,4862015.1160409,null],[670749.27318152,4862013.9520171,null],[670744.50527143,4862013.6096393,null],
[670739.75022791,4862014.0992824,null],[670735.15214202,4862015.4061089,null],[670730.85034857,4862017.4905182,null],
[670726.97520385,4862020.289347,null],[670723.64413555,4862023.717783,null],[670720.95808431,4862027.6719349,null],
[670718.99844495,4862032.0319811,null],[670717.8246,4862036.6658,null]]]

I want to convert the array to a polyline so that I can use Arcade geometry functions on it.

I've searched the docs, but I can't seem to find an Arcade function that converts an array to a polyline. I see there is a FromJSON() function, but I don't think my array is JSON. And I don't see a FromArray() function in the docs.

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How can I convert the array to a polyline using Arcade?

Answer 1

From Polyline | Geometry Functions | ArcGIS Arcade:

Polyline(definition) -> Polyline

Constructs a Polyline object from a JSON string or an object literal. The JSON schema must follow the ArcGIS REST API format for Polyline geometries.

and looking at Geometry objects -- Common Data Types | ArcGIS Developers

Polyline

A polyline (specified as esriGeometryPolyline) contains an array of paths or curvePaths and a spatialReference. ... Each path is represented as an array of points, and each point in the path is represented as an array of numbers.

Given an array of coordinates that is compatible/compliant with JSON formatting, one can directly embed the array into a larger JSON definition for the polyline object.

// array of coordinates that is compliant with JSON formatting
var paths = [
    [[-97.06138,32.837],[-97.06133,32.836],[-97.06124,32.834],[-97.06127,32.832]],
    [[-97.06326,32.759],[-97.06298,32.755]]
];

// embed existing array into large JSON definition for polyline
var polylineJSON = {
  "paths": paths,
  "spatialReference": { "wkid": 3857 }
};
Polyline(polylineJSON);